I searched all through the DIY pages on this subject and found out how to do it but no where did any one discuss the water/citric acid ratio. Can anyone help me with this information.
Thanks
John

__________________
1984 300SD turbo 126
"My true love"

God made me an atheist and who am I to question His wisdom

FSM job #20-015 for the 617 says 10% solution; 100gm of citric acid/1 liter water. FWIW.

__________________
The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)

Just to echo what jbaj007 said: its a 10% weight:volume ratio.

That about 13.5 oz per gallon.

A little higher or lower ratio won't hurt anything.

Brian Carlton says to just put 2.2 lbs of the CA into hot water, and pour it into the block. then top with water, and drive the car for 100 miles and get it really mixed into the radiator and heater core. be sure to degrease first, and flush rinse several times between steps and when done.

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Correct. The system holds about 10L of fluid............thereby needing 1000g of citric acid............which just happens to be 2.2 lbs.

I've used muriatic acid in other iron engine block head combos with excellent results. This was on some terribly neglected cooling systems where the coolant had looked like mud. I've only eyeballed the amounts. Never needed to do this on a MB engine though.

__________________
DJ


84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012